John kennedy



M- @tease-w- JHN, KENNEDY, 0F CHICAGO. ILLINOIS.

Letters Patent No. 84,496, dated Decfmtlfrrl l, 1868.

HoIsTING-MACINE,

To all whom this 'ma/y concern:

Be it known that I, J OHN KENNEDY, of Chicago, in the county of 000k, and State of Illinois, have invented a new and useful Improvement in Hoisting-Machines; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, and letters marked thereon, in which- Figure l is a sectional elevation of Amy invention as attached to a hoisting-machine.

Figure 2, an elevation of the same, taken transversely to iig. l.

Figure 3, an elevation of the cross-tree, removed from the frame of the machine.

The present invention relates to an improvement in the means for reversing the motion of the drum which sustains the ropes of the platform, and holding it in a fixed position; and

Its nature, in part, consists in the application of a two-part spring band, which passes over a wheel on the main drum, and is operated by a rack-lever, which is held in place, when the band is braking the wheel, by a weighted pawl, said leverbeing operated by ropes o r cords passing over pulleys pivoted tc a cross-tree.

To enable others to fully comprehend the construction and operation of my invention, I have marked like parts with similar letters, and will now give a. detailed description.

A A represent the upper frame-Work of an ordinary hoisting-machine, the sections connecting the storiesbel'ow having any well-known construction, and thereforeneeding no desoliption. f

The drum-shaft G, on which the ropes that sustain the platform are wound, supports a drive-wheel, F, and friction-Wheel E, the former wheel being operated in the usual manner by a rope which passes over the wheel and down to the lower story, and the latter wheel being used to control the motion of the drum G, as hereinafter shown.

The upper ends of a two-part band, H J, are pivoted to a short journal, I, supported by one side of the frame A, and the lower end of the part H is brought round to the under part of the wheel E, and fastened to racklever, N, at K, by a pivot-bolt, and the part J is brought round to the same level-,and pivoted to it at L.

This band', H J, is `made of metal, or other suitable material, and it will operate better if it has spring enough to entirely relieve the wheel 'E of friction when the drum-shaft G is to turn.

The lever N is pivoted at M to a short journal, supported by the ame A, and it has notches in one edge, in which the end of a pawl, P, looks, as shown at fig. 1, and an eye at its lower end, to which a rope, Z, is fastened.

This pawl is made of iron, and. pivoted at R to the frame-work A, iig. 2, and it has a cord and Weight, U V, attached to it, at T, to overbalance the Weight of the rope b, attached to thel pawl .at the opposite end,

and used to put it in gear wth'the rack-lever N.

A cross-tree, B, is attached to one side of the frame Y A, and supports two blocks, 0, having pulleys, D D, over which ropes, Z W, pass, the rope Z extending down far enough to be conveniently reached -by the operator on the platform or story below.

One end of the rope W is attached to the lever N,

' and the other end has a weight fastened to it, for the purpose of carrying said leverbackward, and loosening the band H 'J on the friction-wheel E.

Operation. To stop the motion of the drum-shaft Gr, draw on the rope Z, and bring the lever N forward, as shown at g.'

l; then draw on the rope b, and bring the pawl P into position, as shown at same figure. This operation will set the band H J closely against the periphery of the friction-wheel E, and hold it in position, without in any manner 'strainin g the shaft on which the Wheel runs, as the pressure is concentrated.

To loosen the band H J on the friction-Wheel E, draw on rope Z. This operation will loosen the pawl P, and thus permitthe weight c to carry'the same out JOHN KENNEDY. Witnesses:

A. HAYWARD, J As. NORQUET. 

